Readability Checker
Score and improve how readable your text is
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Has anyone told you a page was hard to read without saying which part? Do you write for a general audience but keep the vocabulary of your day job? Readability Checker scores your text against a recognised formula and shows you the sentences pulling the score down.
Short answer: Readability Checker is a free AI tool on EizTools that scores how easy your writing is to read using formulas such as Flesch Reading Ease and Gunning Fog, then flags the sentences making it harder.
What is Readability Checker?
It is an assessment tool rather than a rewriter. You paste text, choose which scoring system to apply and who the audience is, and it returns a reading level with the specific problems behind it: the long sentences, the buried clauses, the jargon that assumes knowledge your reader may not have.
Who Should Use It?
- Writers producing public information, health guidance or policy summaries
- Teachers checking whether material suits a year group
- Marketers whose copy has to land in a few seconds
- Researchers writing plain language summaries alongside technical papers
- Anyone writing in English for readers who learned it as a second language
How Does Readability Checker Work?
Put the passage into the prompt box, set an engine, then expand the accordion and choose a scoring system and an audience before you run it. Press generate and the assessment lands in an output card, whose own reading time pill is a rough second opinion on the text you checked.
Copy the report, or download it as TXT, Word or HTML to share with an editor. Because the activity history panel keeps each run for the session, you can check a paragraph, rewrite it, check it again and watch the score move.
Choosing A Scoring System
Eight formulas are offered, and they disagree with each other by design. Pick the one your field uses.
| Scoring system | What it favours | Good fit for |
|---|---|---|
| Flesch Reading Ease | Short sentences and short words | General web and marketing copy |
| Flesch-Kincaid Grade | A school grade level | Educational material |
| Gunning Fog | Complex word density | Business and technical writing |
| SMOG | Polysyllable count | Health information |
Coleman-Liau, Automated Readability Index, Dale-Chall and a Combined option complete the list. Readability Target sets the audience, from Children and Teens through ESL Readers to Professionals. Complexity Focus narrows the check to vocabulary, sentence length, jargon or passive voice, and a Readability Strictness slider runs from 1 to 10.
A score is not a goal Chasing a number produces choppy writing. Use the flagged sentences, not the score, and keep the technical terms your reader genuinely needs by switching Keep Technical Terms on.
Best Use Cases
What works well
- Turns "this is hard to read" into specific sentences you can fix
- Lets you compare a draft against a target audience level
- Free, with no account and no limit on how much you check
What to watch for
- Formulas count syllables and length, not whether the meaning is clear
- Technical writing scores badly even when it is well written
- Scores from different formulas are not directly comparable
EizTools runs free AI tools without accounts or daily caps, each built for a single job with its own options and a model selector on the page. When the check tells you a passage is too dense, the Text Summarizer is a fast way to see the same content stated plainly, and the writing tools category covers the rest.
Frequently Asked Questions
What reading level should I aim for?
Public information usually targets a level around age eleven to thirteen. Set Readability Target to your actual audience and let Readability Checker report against that rather than chasing a general benchmark.
Does it rewrite the text for me?
It can suggest simplifications when you switch that toggle on, but its main job is assessment. Set Output Style to Rewrite Tips if you want fixes rather than a plain score report.
Why do two formulas give different results?
Each one weighs different features. SMOG counts long words, Flesch weighs sentence length heavily, and Dale-Chall uses a familiar word list, so the same paragraph scores differently under each.
Is it free to use?
Yes. Nothing is charged and nothing is counted, and no account stands in the way, so a long document can be checked section by section and rechecked after every round of edits.
Readability formulas are blunt instruments, and they are still useful, because they point at the sentences you have stopped seeing. Treat the score as a prompt to reread rather than a target to hit.
Paste a page into Readability Checker, set the target audience honestly, and fix the sentences it flags rather than the number it reports.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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